network02.patch - MPSAFE network interrupt

Here's an update to the networking patch:
fetch http://apollo.backplane.com/DFlyMisc/network02.patch
The patch is almost exactly the last patch but with a bug in if_re
fixed (Sepherosa Ziehau).
I'm still on track for a monday commit. There are two other issues
related to the work, but they can be handled in followup commits.
Once I get this in I will go through recent cleanups posted to submit@
and get those in as well.
-Matt